V1
V1 is the player character of ULTRAKILL.
V1 is a blue, vaguely humanoid machine with a long head which bears a resemblance to a CCTV Camera. Printed on the left side of V1's head is a barcode and some unreadable characters. Eight glowing wing-like protrusions come from its back which enable its aerial maneuverability, dashing, and continuous sliding, along with storing weapons that are not in use. "V1" is displayed on the left side of its torso. V1 has the Feedbacker as its left arm, which it uses to punch and deflect projectiles. V1 is almost identical to its successor, V2 but with a deep blue color scheme. Unlike V2 which uses a more standardized heavy plating, V1 has thinner, more fragile chassis. This makes it capable of repairing itself via direct contact with fresh blood. At first, V1 does not have any of its weapons other than its own arm, but will quickly get its first weapon in 0-1: INTO THE FIRE: the Piercer Revolver Piercer Revolver. Variants of already-found weapons can be bought from the terminals, and other weapons can be found throughout the game.
Lore
According to 
V2's entry, V1 was a the first iteration of the V series of robots: a prototype war machine built during the Final War. While many machines of this time were fueled by blood, V1 was special in that it did not require a separate fueling process - it could absorb blood directly into the armor using a new experimental exterior plating, making it able to fight continuously without the need of manually refueling. This new technology had the drawback of being very thin, making the armor quite brittle, but the advantages of on-the-spot repairing and refueling far outweighed the detriments.
However, it never reached full production as a result of the Final War ending and the start of the New Peace. V1 was abandoned and V2 began production to hopefully make up for sunk costs, built as more of a peacekeeper than a war machine, which failed as their manufacturer shut down due to a lack of demand for war machines such as V2 due to the end of all wars.
It is believed that V1 was likely a countermeasure against the 
Earthmovers. The introduction sequence shows V1's last software update being on the 6th of August 2112. The Final War is said to have lasted 2 centuries and is hinted at having started in the early 20th century. As a result, V1 was developed as Earthmovers were the biggest focus of the war and was made to destroy them.
Media
V1's appearance, as seen in 4-S: CLASH OF THE BRANDICOOT
V1 on the cover of the Act I Soundtrack
